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Fair Values of Assets and Liabilities - Quantitative Inputs and Assumptions Used in Level 3 Fair Value Measurements (Detail) (USD $) |  |  | 3 Months Ended |  |  | 3 Months Ended |  | 3 Months Ended |
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Dec. 31, 2012 | Mar. 31, 2013 Pooled Trust Preferred Collateralized Debt Obligations [Member] | Mar. 31, 2013 Pooled Trust Preferred Collateralized Debt Obligations [Member] Minimum [Member] Discount rates [Member] | Mar. 31, 2013 Pooled Trust Preferred Collateralized Debt Obligations [Member] Maximum [Member] Discount rates [Member] | Mar. 31, 2013 Pooled Trust Preferred Collateralized Debt Obligations [Member] Discounted Cash Flow [Member] Minimum [Member] Probability of default [Member] | Mar. 31, 2013 Pooled Trust Preferred Collateralized Debt Obligations [Member] Discounted Cash Flow [Member] Minimum [Member] Prepayment rates [Member] | Mar. 31, 2013 Pooled Trust Preferred Collateralized Debt Obligations [Member] Discounted Cash Flow [Member] Maximum [Member] Probability of default [Member] | Mar. 31, 2013 Pooled Trust Preferred Collateralized Debt Obligations [Member] Discounted Cash Flow [Member] Maximum [Member] Prepayment rates [Member] | Mar. 31, 2013 Pooled Trust Preferred Collateralized Debt Obligations [Member] Discounted Cash Flow [Member] Weighted average [Member] Probability of default [Member] | Mar. 31, 2013 Pooled Trust Preferred Collateralized Debt Obligations [Member] Discounted Cash Flow [Member] Weighted average [Member] Prepayment rates [Member] | Mar. 31, 2013 Equity Securities [Member] | Dec. 31, 2012 Interest Rate Swap [Member] | Mar. 31, 2013 Interest Rate Swap [Member] Option model [Member] Minimum [Member] Counterparty credit risk [Member] | Mar. 31, 2013 Interest Rate Swap [Member] Option model [Member] Maximum [Member] Counterparty credit risk [Member] | Mar. 31, 2013 Impaired Loans [Member] | Mar. 31, 2013 Impaired Loans [Member] Reserve Study [Member] NGL per gallon [Member] | Mar. 31, 2013 Impaired Loans [Member] Reserve Study [Member] Minimum [Member] Gas per MCF [Member] | Mar. 31, 2013 Impaired Loans [Member] Reserve Study [Member] Minimum [Member] Oil per BBL/d [Member] | Mar. 31, 2013 Impaired Loans [Member] Reserve Study [Member] Maximum [Member] Gas per MCF [Member] | Mar. 31, 2013 Impaired Loans [Member] Reserve Study [Member] Maximum [Member] Oil per BBL/d [Member] | Mar. 31, 2013 Impaired Loans [Member] Reserve Study [Member] Weighted average [Member] Discount rates [Member] | Mar. 31, 2013 Other Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | $ 1,216,011,000 | $ 24,512,000 |  |  |  |  |  |  |  |  |  |  | $ 1,420,000 | $ 0 |  |  |  |  | $ 734,000 | [1] |  |  |  |  |  |  |  |  |  |  |  |  | $ 215,000
Weighted average rate |  |  | 6.25% | [2] | 18.00% | [2] | 0.00% | 0.00% | 100.00% | 81.75% | 21.44% | 9.60% |  |  | 8.56% | [3] | 10.31% | [3] |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% | [3] |
Fair Value Inputs Monetary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.54 | [4] | $ 3.67 | [4] | $ 90.97 | [4] | $ 7.60 | [4] | $ 106.00 | [4] |  |  |
[1] | the remainder of impaired loans valued using Level 3 inputs are not included in this disclosure as the values of those loans are based on bankruptcy agreement documentation.
[2] | incorporates spread over risk free rate related primarily to credit quality and illiquidity of securities.
[3] | represents the range of the credit spread curve used in valuation.
[4] | unobservable inputs are defined as follows: MCF - million cubic feet; BBL/d - barrels per day; NGL - natural gas liquid.

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- Definition Fair Value Weighted Average Inputs Price + References No definition available. + Details
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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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